5 results about "Static displacement" patented technology

This invention provides a structural displacement reconstruction method, system, and medium based on finite element model correction. The method includes: acquiring a dual-network strain modal prediction model, including a first network model and a second network model; inputting the current measured modal information of the structure under test into the first network model to invert and obtain the predicted finite element model parameters of the preset finite element model; inputting the predicted finite element model parameters into the second network model to predict the predicted strain modes of the structure; solving for the modal coordinates based on the measured strain response and predicted strain modes during the operation of the structure under test; and reconstructing the dynamic or static displacement of the structure based on the modal coordinates and the measured displacement modal information of the structure. Using this invention, indirect reconstruction from measurable strain response to target displacement is achieved, improving the overall accuracy of displacement reconstruction of the structure under test.

The invention discloses a vertical shear stiffness quantitative identification and safety monitoring evaluation method for a new and old widened bridge joint, and belongs to the field of bridge engineering safety detection and structural performance monitoring. The invention relates to a method for identifying the rigidity of an abutted seam of a widened bridge, which is characterized in that under the excitation of a low-speed vehicle load, the ratio of response time cumulants of quasi-static displacement generated in the midspan of a new bridge and an old bridge and the vertical rigidity of the abutted seam connecting the two have a clear and stable mathematical mapping relationship; and a stable and reliable dimensionless identification index which is directly associated with the abutted seam rigidity is constructed, so that quantitative evaluation of the health state of the abutted seam is realized. The invention discloses a new and old widened bridge joint safety assessment method. The method comprises the following steps: step 1, arranging a new and old widened bridge joint structure performance monitoring system; 2, deploying a signal processing module and a parameter calculation and state evaluation module in a background; and step 3, deploying a display and monitoring early warning module on a client, wherein a manager can see the content of the display and monitoring early warning module.

The invention relates to the technical field of structural dynamic response prediction, and particularly discloses a transverse response prediction method for a high-rise building under the action of multiple external strong impacts, which comprises the following steps: S1, determining the quality of each floor, the interlayer rigidity, the characteristic quality of each order, the damping ratio, the inherent frequency, the damping frequency and the vibration mode matrix of the high-rise building; s2, determining load characteristic parameters of each point location under multiple strong impact loads; s3, calculating a generalized load peak value of strong impact by utilizing the vibration mode matrix and peak value distribution; s4, calculating generalized static displacement by utilizing the characteristic mass of each order, the damping frequency and the generalized load peak value; s5, calculating the dynamic coefficient and inheritance quantity of each strong impact by using the generalized static displacement; s6, substituting the dynamic coefficient and the inheritance quantity into a prediction formula, and calculating a lateral displacement response; according to the method, the generalized load peak value, the generalized static displacement, the dynamic coefficient and the inheritance quantity are calculated, and the prediction formula is combined, so that the transverse response of the high-rise building under the action of multiple external strong impacts is calculated.

The application discloses a kind of track vehicle dynamic limit calculation method based on fluid-solid coupling and rigid-flexible coupling, comprising: constructing the three-dimensional geometric model of track vehicle and flow field calculation domain, setting flow field boundary condition;Apply time-varying wind load condition, solve the aerodynamic force and aerodynamic moment suffered by vehicle by the transient solver of finite volume method;Establish vehicle rigid-flexible coupling multibody dynamics model, set observation point and record initial coordinate value;Aerodynamic force and aerodynamic moment are input into multibody dynamics model to calculate the dynamic displacement of observation point, obtain the maximum value of dynamic displacement;Calculate the static displacement of each observation point;Initial coordinate value, dynamic displacement maximum value and static displacement are superimposed, and dynamic envelope limit coordinate is obtained, to generate dynamic envelope limit;The application improves the physical reality and engineering applicability of dynamic envelope limit calculation, and provides technical support for the safe operation of track vehicle, railway limit standard formulation and safety evaluation of existing infrastructure.

This invention provides a simulation method and system for a three-dimensional wheel-rail contact model in a switch area, belonging to the field of railway engineering technology. The method includes: applying a gravity load to the wheel-rail finite element model of the switch area based on its structural contact characteristics to generate an initial static displacement field; applying an initial angular velocity to the wheelset based on the initial static displacement field; determining an asymmetric quasi-steady-state solution under the wheel-rail structural contact characteristics of the switch area based on the initial angular velocity application result; generating a dynamic relaxation file based on the asymmetric quasi-steady-state solution to record the steady-state displacement and stress state of each node in the switch area; loading the dynamic relaxation file as the initial state; simulating the process of the wheelset passing through the switch area; and outputting real-time dynamic response results. This invention effectively improves the numerical stability and physical consistency of the wheel-rail dynamic response in the switch area, providing a reliable foundation for accurately analyzing wheel-rail interaction and the safety performance of the switch area.